Coordinate measuring apparatus and method for controlling the same

US5895444A · kind A · utility

Assignee

• Carl Zeiss Stiftung · DE

Inventors

• Otto Ruck · Ellwangen (Jagst), DE
• Ralf Bernhardt · Aalen, DE
• Martin Wimmer · Neubiberg, DE

Key dates

• Filing date: Dec 18, 1997
• Grant date: Apr 20, 1999
• Expiry date: Dec 18, 2017

Classification

• Technology area (CPC G): Physics
• CPC primary: G05B2219/50353
• WIPO field: Control
• WIPO sector: Instruments

Abstract

The invention is directed to a method for controlling a coordinate measuring apparatus wherein the probe head (2) and the probe pin (19) of the apparatus are control driven in accordance with desired data Pi. The probe pin (19) is movably attached to the probe head (2). In the method, the probe pin for measuring the workpiece (15) can touch down on the surface of the workpiece to be measured or can be lifted off of this surface. The speed of measurement is increased by selecting the angle (.alpha.down, .alpha.up) between the direction of movement vres of the probe head (2) when touching down or when lifting off and the projection of the direction of movement toward the plane tangential to the workpiece surface in the touchdown/liftoff point (Pdown, Pup) to be less than 30.degree..